The original post seems like it's saying they're ex-dubs. Is this correct?
I've had no problem with my family members who are ex-JWs. From my 2 parents who started in it, they lured in other family members (and others born into it). In all, there were 14. 2 died in it and of the other 12, only 3 are still JWs. The rest have all dropped out.
They've all left for their own reasons, which is why introducing CoC worked with them. My niece left, but still kept feeling guilty, like maybe they're right. I sent her CoC. Recently an aunt made contact after not hearing from her for about 15 years. She dropped out and sounds like her son went apostate and was still bitter about it. I told her about CoC and she ordered copies for herself and her son. Might help explain why they feel like they do and do some healing.
Bottom line, is if they are ex JWs, they have their own gripe with the WTBS and introducing it may not be that hard. For current JWs, I honestly can't say. My dad won't get near any of that stuff. And you run the risk of being shunned by introducing it.
One thing I thought of mentioning was the whole 1914 chapter. How they proposed the genea explaination for generation back in the 70's (or was it early 80's) and it wasn't until 1994 that that was adopted. I thought that would strike up an interest. Like, how did an "apostate" know about genea not being a lifetime before we as JWs collectively "realized" it? Then it would lead to further questions, like, was this really proposed way back then? And why didn't the governing body realize it was the truth way back then, if they are really directed by God? Maybe even lead to questioning how the GB actually makes policy. And, luckily, there are chapters on that. (to clarify, I don't believe their twist on genea either - another dodge to buy time)
I was still a JW when I read it, but inactive. Once I started, I couldn't put it down. It's been years since I've read it. Maybe if you could photocopy a few of the historical parts. The less controversial ones - pages where they aren't being criticized too harshly. Ask them if they want to read it. Might whet their appetite for more.